im not getting good vibrations, im getting bad ones, lol

[veze]

well, ive bought another engine for my nc29, theres a few minor problems with it. second gear makes an awefull whirling sound on the revolutions of the engine, though all the other gears are fine, my dad thinks it may be an idle gear gone? and the other is it vibrates! . ive had the head ofrf and had a valve job on it and a new head gasket, and the compression is fine, ive just syncd the carbs and it idles and fuels fine, at first when i tried to sync the carbs, they sounded a bit rough. the pilot screws were set at 1 1/2 turns, cylinder one was stone cold, though there was good compression, spark and fuel. so i wound them out to 2 1/2 and it runs chirpy as a bird. idles perfect . Theres one thing that bothers me though is vibration. ive just changed the front wheel bearing 2 days ago so it cant be those. its not alot of vibration but its enough to give u pins and needles after about 30 mins of riding at about 7-8000rpm. all the engine mounting bolts are secure and tight, with the spacers in the correct places. what else can cause vibration?
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tlm50,mt5,sr50. rs125 extrema, cbr 400rr nc29 suzuki gs500e.Honda cbx250 rs . FJ1200 .fz6,fjr1300

[steo]

does it feel like the vibrations are coming from the engine or from the rolling chassis itself?

[tshort2007]

Try revving the bike in neutral, and see if it vibrates. If not - Its a drivetrain issue (wheels, tyres, chain etc)

If it does still vibrate, somthings not right in the engine department!

[veze]

okie dokey, i will have a try in a bit.
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tlm50,mt5,sr50. rs125 extrema, cbr 400rr nc29 suzuki gs500e.Honda cbx250 rs . FJ1200 .fz6,fjr1300

[veze]

right well ive just checked and its definatley on the engine, maybe the cranks on its way out or something?
the good news is though, ive got another engine that dropped a valve, but a week or two before it did it, i had the crank re-shelled a nd the gear box was alot mor solide, so i was thinking, if i chop these engines together, with the good top end on one and the good and sound bottom end on the other, will make a good engine. my dad says that its fairly easy changing a gear box but changing the whole bottom end is tricky, what sort of work is involved and is it easy for someone thats pretty ok with spanners etc.
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tlm50,mt5,sr50. rs125 extrema, cbr 400rr nc29 suzuki gs500e.Honda cbx250 rs . FJ1200 .fz6,fjr1300

[steo]

before you start giving yourself a mountain of engine work to do, whip off the clutch casing & check the clutch. honda's have notoriously rattly clutches & if the housing is loose, worn or the plates assembled wrong in a previous life then it could be the reason for your engine vibration. i think it would be more obvious if the crank was the problem.

[veze]

would it be worth just swapping the clutches over? ive notice it doesnt pull off very well, you needs to spins the clutch a bit because other wise it doesnt engage verywell, you can feel a little bit of knocking when you put it under load. like you say, i crank knock would probably be alot more pronounce
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tlm50,mt5,sr50. rs125 extrema, cbr 400rr nc29 suzuki gs500e.Honda cbx250 rs . FJ1200 .fz6,fjr1300

[tshort2007]

theres no reason why not. Its simple enough to do, and it rules one thing out at least!

[veze]

reet just put a new x-ring chain and sprockets on. the knock has gone but the the engine still vibrating , i will try and get a look inside it next weekend.
____________________
tlm50,mt5,sr50. rs125 extrema, cbr 400rr nc29 suzuki gs500e.Honda cbx250 rs . FJ1200 .fz6,fjr1300

[veze]

reet just put a new x-ring chain and sprockets on. the knock has gone but the the engine still vibrating , i will try and get a look inside it next weekend.
____________________
tlm50,mt5,sr50. rs125 extrema, cbr 400rr nc29 suzuki gs500e.Honda cbx250 rs . FJ1200 .fz6,fjr1300

[veze]

reet just put a new x-ring chain and sprockets on. the knock has gone but the the engine still vibrating , i will try and get a look inside it next weekend.
____________________
tlm50,mt5,sr50. rs125 extrema, cbr 400rr nc29 suzuki gs500e.Honda cbx250 rs . FJ1200 .fz6,fjr1300